Extendable window blind



FIG. 1 is a perspective view of an extendable window blind showing my new design;

FIG. 2 is a front elevation view of the extendable window blind thereof;

FIG. 3 is a rear view of the extendable window blind thereof;

FIG. 4 is a right side view of the extendable window blind thereof.

FIG. 5 is a top plan view of the extendable window blind thereof;

FIG. 6 is a bottom plan view of the extendable window blind thereof; and,

FIG. 7 is a perspective view of the extendable window blind of FIG. 1 shown fully closed. 

CLAIM I claim the ornamental design for an extendable window blind, as shown and described. 